Trailhead tire deflators are automatic tire deflators used to lower tire pressure for improved traction off road. The lower air pressure provides a larger contact patch and thus greater floatation in soft surfaces like sand and mud. Lower air pressure also allows the tire to flex more and conform to uneven surfaces like rocks and logs. Unlike other deflators Trailhead tire deflators are DOT approved which means you can actually install the deflators when you get to the trail and drive while airing down, the deflators stop automatically at the pre-set pressure.
Trailhead deflators are available in two different pressure ranges: